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Andrew Morton <akpm@osdl.org> writes: > Looking at Andi's patch, it is also a dead box if the fault happens inside > down_write(mmap_sem). That should be fixed, methinks. The only way to fix all that would be to move the instruction checks early into the fast path. [On a P4 the overhead is 3.7268 vs 3.6594 microseconds for a fault that doesn't hit as measured by lmbench2's lat_sig. This was before the latest changes which added more checking, so the overhead is probably bigger now] -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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